16309 is nontrivially palindromic in base 7.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90361 = 109 ⋅829.
It is a cyclic number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
16309 is a lucky number.
It is a nialpdrome in base 12.
It is a congruent number.
216309 is an apocalyptic number.
It is an amenable number.
16309 is an equidigital number, since it uses as much as digits as its factorization.
16309 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 394.
The square root of 16309 is about 127.7066952043. The cubic root of 16309 is about 25.3596026368.
Subtracting from 16309 its sum of digits (19), we obtain a triangular number (16290 = T180).
Adding to 16309 its product of nonzero digits (162), we get a triangular number (16471 = T181).
The spelling of 16309 in words is "sixteen thousand, three hundred nine".